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  1. Replies
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    A key observation to make is that despite the way...

    A key observation to make is that despite the way the figure is drawn, the missing angle (the one on the lower left) is 90 degrees. This is because all angles of the quadrilateral must sum to be...
  2. Check out this post on the remainder rule:...

    Check out this post on the remainder rule: http://www.urch.com/forums/gre-math/133792-please-help-q-3.html#post869216
    Basically when we multiply two numbers a and b together and then find their...
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    All we can say about the second problem is this:...

    All we can say about the second problem is this:
    Abby and Brian must have started with at least 5 chips a piece. If not, then even if Abby had 4 chips and lost them all then Brian could only have 8...
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    The two ways I would do problem 2: First way. ...

    The two ways I would do problem 2:

    First way. This path could lead you into trouble and waste time in general but I figured it wouldn't take too long. Notice that the answer choices A and B are...
  5. You probably want to post these questions in the...

    You probably want to post these questions in the forum section for the math section of the general GRE. This forum is located here: GRE Math

    I'll answer 1 and 3 since I don't really understand 2....
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    It is important to note that the question states...

    It is important to note that the question states that x and y are positive integers so you shouldn't (without proper reasoning) plug in 0 for x or y. Now because divisibility works the way it...
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    Yes that is exactly how I always think of it. A...

    Yes that is exactly how I always think of it. A little note that I'm sure you are aware of though is that it is actually 4! * 2! . So if we had to arrange n people around a table such that one...
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    The first powerprep test I took required me to...

    The first powerprep test I took required me to know how many quarts were in a gallon. Actually though, I think you just needed to know that a quart was smaller than a gallon. On the actual GRE I...
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    I'm pretty sure everything here is correct but I...

    I'm pretty sure everything here is correct but I cannot guarantee it as I have not done normal distributions in awhile.

    The area between the 15th and 30th percentiles must be the same as the area...
  10. A decent explanation I made back in the day. Not...

    A decent explanation I made back in the day. Not my best but its all I got.

    http://www.urch.com/forums/gre-math/132462-salary-new-gre-question.html

    It is important that you understand the...
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    First question answered here:...

    First question answered here: http://www.urch.com/forums/gre-math/134741-points.html

    2)
    Way to determine maximum number of groups:
    3 + 2(7) + 3 = 20. So we can have 9 groups with 2 groups of 3...
  12. Thread: Points

    by twohundredping
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    670

    Since S is not on the line PQR, PQS will always...

    Since S is not on the line PQR, PQS will always be able to form a triangle. From the triangle rule, PS < PQ + QS = PQ + QR. Since Q is between P and R this reduces to PS < PQ + QR = PR.

    Your...
  13. Thread: math

    by twohundredping
    Replies
    3
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    486

    The first approach I thought of was an inequality...

    The first approach I thought of was an inequality approach.
    Since P lies below line l, P satisfies y < 3x - 3 which gives t < 3r - 3 which rearranges to 3r - t > 3
    We can quickly determine that the...
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    From the question given, I shouldn't have assumed...

    From the question given, I shouldn't have assumed that this was exponential growth. I think I arbitrarily chose exponential growth just because it made the problem more interesting. You are correct...
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    The fact that you have a prime number of extra...

    The fact that you have a prime number of extra outcomes is inconsequential. This is because the valid approach uses addition and the invalid approach uses multiplication. If you want to go through...
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